https://doi.org/10.1140/epjst/e2012-01620-5
Regular Article
Resonant X-ray diffraction of self-assembled epitaxial systems: From direct to complementary chemical information
1 Instituto de Física, Universidade de Brasília, Brasília DF, CEP 70910-900, Brazil
2 Laboratório Nacional de Luz Síncrotron, C.P. 6192, Campinas, SP, CEP 13085-903, Brazil
3 Departamento de Física, Universidade Federal de Minas Gerais, CP 702, Belo Horizonte, MG, Brazil
a e-mail: angelomalachias@yahoo.com
Received:
4
December
2011
Revised:
23
March
2012
Published online:
15
June
2012
In this work we depict schematically the use of resonant (anomalous) X-ray diffraction as a tool to directly probe strain and composition of self-assembled semiconductor islands. By employing a direct analysis at the Eu L3 edge its composition gradient is quantified for EuTe:SnTe capped islands. Projection maps are proposed to visualize the results, providing an alternative capability to infer quantum dot properties. A more complex methodology is applied to the study of InP:GaAs islands, in which complementary anomalous measurements are performed. For this system the number of samples analyzed allows us to extract the activation energy for Ga adatoms diffusion from the substrate to the islands.
© EDP Sciences, Springer-Verlag, 2012